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Standard X

Chemistry

Chemical Properties

a drop of phe...

Question

a drop of phenolphthalein was added to aqueous solution of a salt X of sodium metal. The solution turned pink when dilute HCl acid was added to it and produced effervescence due to the evolution of gasY. the gas Y turned lime water milky.
1) identify salt X
2) identify Y
3) identify the base and acid which on reaction would produce the salt X
4) why does salt X give pink colour with phenolphtalein solution?

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Solution

1. Salt X is sodium carbonate (Na₂CO₃).

2. Gas Y is carbon dioxide (CO₂).

3. The base and acid that produce sodium carbonate are Sodium hydroxide and Carbonic acid. The reaction is as follows:

2 NaOH (aq) + H₂CO₃(aq) $\to$ Na₂CO₃(aq) + H₂O(l)

4. Sodium Carbonate is basic in nature as it is salt of strong base and weak acid. So, it gives pink colour with phenolpthalein.

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